The results of an eight-year study of overweight workers by researchers at Duke University compared the health of workers classed as obese to those in the recommended weight class. Those classed as obese had twice as many workers' compensation claims, had medical claims costs that were seven times higher and had 13 times as many lost work days as those in the recommended class.
See: Trulstbye, John M. Dement and Katrina M. Krause, "Obesity and Workers' Compensation: Results From the Duke Health and Safety Surveillance System." Archives of Internal Medicine, Vol. 167, No. 8, April 23, 2007
PDF can be downloaded at: http://archinte.ama-assn.org/cgi/reprint/167/8/766